[sr-dev] Outbound: removing contact for broken flow

Daniel-Constantin Mierla miconda at gmail.com
Thu Feb 28 21:20:08 CET 2013


On 2/28/13 6:25 PM, Peter Dunkley wrote:
> Hello,
> I want to add a new function to the registrar module that will allow 
> me to remove a contact from the location table when I receive a 430 
> from an edge proxy.
> I believe I can use the get_ucontact_by_instance() function from 
> usrloc to remove the exact contact I want (based on contact address, 
> sip.instance, and reg-id).  However, at the point at which I have 
> received a 430 from the edge proxy (in the failure_route[] on the 
> registrar) I am not sure how I can determine the sip.instance and 
> reg-id.  As far as I can tell neither of these values is added to the 
> request when the registrar:lookup() exported function is called.
> I don't want to just remove contacts based on address, or even address 
> and sip.instance, because when outbound is used I will have multiple 
> contacts with the same address and sip.instance values, with only the 
> reg-id different.
> Does anyone have any suggestions as to how I can obtain this 
> information in a failure_route[]?
I am not sure that data in request can be really useful in this case for 
a general solution. Have in mind parallel forking, when only one branch 
gets in failure_route, so if one branch gets 430 and and another one 
3xx, the one for 3xx is handled.

Maybe handling in onreply_route would be better. The field ruid might 
need propagation to dst set (and branch) -- that's unique identifier for 
location records, making very easy to find and remove desired contact.


Daniel-Constantin Mierla - http://www.asipto.com
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
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